Originally Posted by
GarageDragon
Do you use bigger seam allowance? I tried using some polyester and ended up having to serge all the seams to stop it coming apart. I am still a bit of a newbie (only three quilts so far, but all finished!) so maybe I was doing it wrong?
You generally shouldn't need to unless it has a special coating or something. For piecing, you want to use a shorter stitch length than for quilting. I use a 1.8-2.0mm stitch length for piecing & a 2.8-3.0mm stitch length for quilting.
As long as you use a decent poly thread (I like Guterman 100% poly, but it sheds like crazy; Aurifil also has a good quality 100% poly thread this isn't as stiff & sheds less) that isn't too old & you are using a short stitch length, you shouldn't need to overcast the seams.
Of course, all these tips are for all poly fabrics. If you mix & match fibers, I'm not sure what to suggest because I've never had good luck with that.